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If the electron in hydrogen atom jumps from second Bohr orbit to group state and difference between energies of the two state is radiated in the form of photons. If the work function of the material of photons. If the work function of the material is 4.2eV then stopping potential is (energy of electron is nth orbit `=(13.6)/(n^(2))eV)`

A

2eV

B

4eV

C

6 eV

D

8eV

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The correct Answer is:
A
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